Most of the crimes associated with drugs are with the dealing and with money laundering -- both of which would go away if drugs were legalized. Sure, people steal to buy drugs, but then people steal to buy Nikes, too. We'll prosecute them either way. Alcohol and tobacco are legal and you don't see too many gangland crimes associated with them. And, finally, you get to tax a lucrative industry as well as establish quality control standards on the product.
Whatever vices a person may have should be none of anyone else's business. If he usese the vice as an excuse to commit a crime, hammer him for the crime, because others are quite capable of indulging in the same vice without affecting their neighbors. For example, I like to drink. I do not drive drunk, however. If someone drives drunk and kills someone he should be prosecuted for killing someone, not for drinking, which others do quite responsibly.
Of course, the folks that are most against vices are those who, deep down inside, know they cannot control themselves if given any sort of license and project that failing upon everyone else.
If you don't like porn, good for you. Don't, however, take it upon yourself to dictate whether any other adult can partake of it. I don't like it when liberals try to curtail my freedoms "for the good of society" (remember Hillary Clinton's recent speech? "We'll take it from you, for the common good") and I don't like it when so-called conservatives want to do it for the same reason. Real conservatives understand the concept of "mind your own business."
If we are to believe the statistics, then porn leads to, for example, rape. Legal porn would lead to more rape. Granted, we would then prosecute and punish the rapist, but I'm saying let's prosecute and punish the producer of violent porn (simulated rape movies, eg) to minimize the crime caused by it.
You and your "victimless crimes" crowd will be the first to complain that we're locking up non-violent porn producers who have injured no one when we should be going after the rapists. You fail to see that we are going after the rapists by locking up the porn producers.